While I'm on that topic, where does all the money sent to Arabia for oil go? It comes right back here (or some of the major European banks). Then, when they withdraw their funds for expenditures, who is the money paid to? Foreign companies/workers (Haliburton, Bechtel, et al) who build and maintain their infrastructure.
You see, when you're the big dog, you get a cut of everyone's action. They can't go anywhere without going through us. Which, of course, is what's driving world-wide Anti-Americanism; they're merely defeated socialists shaking their puny fists as the Colossus spreads capitalism everywhere through a system of our own making.
So yes, the dollars come back -- returned with malice.